Automatic group transmission

Abstract

An automated group transmission having a multi-stage main transmission (HG), a splitter group (VG) connected upstream from the main transmission (HG) and a two-stage range-change group (BG) connected downstream of the main transmission (HG), such that the splitter group (VG) is connected, via a controllable separator clutch, to a drive motor. The main transmission (HG) and the range-change group (BG) are of either a synchronized or an unsynchronized design and the shifting clutches of two respective transmission ratio steps, in at least one of the partial-transmissions (VG, HG, BG), are respectively combined in a common shifting packet with two shift positions and a neutral position. To speed up most range shifts, it is provided that in the main transmission (HG) the shifting clutches associated with the lowest transmission ratio step (G 1 ) and with the highest transmission ratio step (G 4 or G 3 ) are combined in a common shifting packet (S 1/4 or S 1/3 ).

1. A group transmission comprising:
 a multi-stage main transmission (HG) having either three forward gears or four forward gears, 
 a splitter group (VG) being connected upstream of the main transmission (HG), and 
 a two-stage range-change group (BG) being connected downstream of the main transmission (HG), and 
 at least one of the multi-stage main transmission (HG), the splitter group (VG) and the range change group (BG) having shifting clutches, such that the splitter group (VG) being connected, via a controllable separator clutch, to a drive motor in the form of an internal combustion engine, the main transmission (HG) and the range-change group (BG) being of synchronized or unsynchronized design, and 
 the shifting clutches of two respective transmission ratio steps in at least one of the multi-stage main transmission (HG), the group (VG) and (BG) are respectively combined in a common shifting packet with two shift positions and a neutral position, 
 wherein in the main transmission (HG) the shifting clutches associated with a lowest transmission ratio step (G 1 ) and with a highest transmission ratio step (G 4  or G 3 ) are combined with one another in a common shifting packet (S 1 / 4  or S 1 / 3 ). 
 
     
     
       2. The group transmission according to  claim 1 , wherein a direct-shift clutch (SV) is provided, which is arranged axially on an input side, for connecting an input shaft (W 1 ) of the splitter group (VG) to a main shaft (W 2 ). 
     
     
       3. The group transmission according to  claim 1 , wherein the group transmission comprises two countershafts (W 3   a , W 3   b ). 
     
     
       4. A group transmission comprising:
 a multi-stage main transmission (HG) having three forward gears, 
 a splitter group (VG) being connected upstream of the main transmission (HG), and 
 a two-stage range-change group (BG) being connected downstream of the main transmission (HG), and 
 at least one of the multi-stage main transmission (HG), the splitter group (VG) and the range change group (BG) having shifting clutches, such that the splitter group (VG) being connected, via a controllable separator clutch, to a drive motor in the form of an internal combustion engine, the main transmission (HG) and the range-change group (BG) being of synchronized or unsynchronized design, and 
 the shifting clutches of two respective transmission ratio steps in at least one of the multi-stage main transmission (HG), the splitter group (VG) and the range change group (BG) are respectively combined in a common shifting packet with two shift positions and a neutral position, 
 wherein in the main transmission (HG) the shifting clutches associated with a lowest transmission ratio step (G 1 ) and with a highest transmission ratio step (G 4  or G 3 ) are combined with one another in a common shifting packet (S 1 / 4  or S 1 / 3 ), 
 a direct-shift clutch (SV) is provided, which is arranged axially on an input side, for connecting an input shaft (W 1 ) of the splitter group (VG) to a main shaft (W 2 ), and 
 the group transmission comprises two countershafts (W 3   a , W   3   b). 
 
     
     
       5. A group transmission comprising:
 a multi-stage main transmission (HG) having four forward gears, 
 a splitter group (VG) being connected upstream of the main transmission (HG), and 
 a two-stage range-change group (BG) being connected downstream of the main transmission (HG), and 
 at least one of the multi-stage main transmission (HG), the splitter group (VG) and the range change group (BG) having shifting clutches, such that the splitter group (VG) being connected, via a controllable separator clutch, to a drive motor in the form of an internal combustion engine, the main transmission (HG) and the range-change group (BG) being of synchronized or unsynchronized design, and 
 the shifting clutches of two respective transmission ratio steps in at least one of the multi-stage main transmission (HG), the splitter group (VG) and the range change group (BG) are respectively combined in a common shifting packet with two shift positions and a neutral position, 
 wherein in the main transmission (HG) the shifting clutches associated with a lowest transmission ratio step (G 1 ) and with a highest transmission ratio step (G 4  or G 3 ) are combined with one another in a common shifting packet (S 1 / 4  or S 1 / 3 ), 
 a direct-shift clutch (SV) is provided, which is arranged axially on an input side, for connecting an input shaft (W 1 ) of the splitter group (VG) to a main shaft (W 2 ), and 
 the group transmission comprises two countershafts (W 3   a , W   3   b).